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How should PXI-2503 Com 1-3 be terminated in 2-wire 24x1 Mux mode

I am using a PXI-2503 Mux in 2-wire 24x1 Mux mode. How should Com1 - Com3 lines be terminated? Should they be left open, grounded, or tied to Com0?
Bob
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Hello Bob,
 
They should be left open
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